Reference for Niddah 62:5

הרוצה לעשות כל בניו זכרים יבעול וישנה

but R. Johanan stated: A woman conceives only immediately after her ritual immersion, for it is said, And in cleansing<span class="x" onmousemove="('comment',' E.V., 'sin'. ');">⁴</span>

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